Pharmaceutical compositions containing benzothiophene derivatives

ABSTRACT

BENZOTHIOPHENE DERIVATIVES HAVING THE STRUCTURAL FORMULA DESCRIBED BELOW, A METHOD FOR THEIR PREPARATION AND PHARMACEUTICAL PREPARATIONS CONTAINING THEM. THESE PREPARATIONS ARE USEFUL AS ANALGESIC, ANTIPYRETIC, ANTIINFLAMMATORY, ANTITUSSIVE AGENTS, AS LOCAL ANAESTHETICS AND ANTISPASMODIC AND ANTIHISTAMINIC AGENTS. THEY HAVE THESE PROPERTIES COMBINED WITH RELATIVELY LOW TOXICITY. THEY MAY, THEREFORE, BE USED FOR THE RELIEF OF PAIN, INFLAMMATION, PYRESIS OF VARIOUS ORIGINS, OR TUSSIVE IRRITATION.

United States Patent Omce 3,594,478 PHARMACEUTICAL COMPOSITIONS CONTAIN- ING BENZOTHIOPHENE DERIVATIVES Arne Elof Brandstrom, Goteborg, and Stig Ake Ingemar Carlsson, Molnlycke, Sweden, assignors to Aktiebolaget Hassle, Goteborg, Sweden No Drawing. Division and Continuation-impart of application Ser. No. 553,016, May 31, 1966. This application Nov. 24, 1969, Ser. No. 879,516 Claims priority, appligatiosn ssweden, June 1, 1965,

,12 /6 Int. Cl. A61u 27/00 US. Cl. 424-248 16 Claims ABSTRACT OF THE DISCLOSURE Benzothiophene derivatives having the structural formula described below, a method for their preparation and pharmaceutical preparations containing them. These preparations are useful as analgesic, antipyretic, antiinflammatory, antitussive agents, as local anaesthetics and antispasmodic and antihistaminic agents. They have these properties combined with relatively low toxicity. They may, therefore, be used for the relief of pain, inflammation, pyresis of various origins, or tussive irritation.

R2 (wherein R represents a lower alkyl group or an unsubstituted or substituted phenyl group in which any substituent is a lower alkyl, lower alkoxy, dioXy-lower alkylene or trifluoromethyl group or a fluorine, chlorine or bromine atom, R represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group, R represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group or, provided R is a hydrogen atom, a nitro, amino, hydroxy, lower acyloxy, lower dialkylamino or lower acylamino group, A represents an alkylene group containing not more than four carbon atoms, R represents a hydrogen atom or a lower alkyl group, R represents a lower alkyl or benzyl group, or

represents a pyrrolidino, piperidino, hexamethyleneimino, morpholino, lower dialkylmorpholino, piperazino, lower alkylpiperazino, N-benzylpiperazino or tetrahydropyridino group) in the form of the free base or of a pharmaceutically acceptable salt thereof.

3,594,478 Patented July 20, 1971 2 Illustrative meanings for the various in the aforesaid formula are as follows: A: -CH2CH2-, -CH(CH )-CH or CH(CH )CH(CH 5 R: methyl, ethyl, n-propyl, isospropyl, n-butyl, iso-butyl,

n-amyl, phenyl, o-tolyl, m-tolyl, p-tolyl, 2,4-dimethylphenyl, 2-chloro-4-methylphenyl, o-methoxyphenyl, mmethoxyphenyl, p-methoxyphenyl, o-ethoxyphenyl, m ethoxyphenyl, p-ethoxyphenyl, 3,4 methylenedioxyphenyl, p-n-propoxyphenyl, p-isopropoxyphenyl, p-nbutoxyphenyl, o-chlorophenyl, m-chlorophenyl, p-chlorophenyl, o-bromophenyl, m-bromophenyl, p-bromophenyl, o-fluorophenyl, m-fluorophenyl, p-flnorophenyl, o-trifluoromethylphenyl, m-trifluoromethylphenyl or ptrifiuoromethylphenyl;

R and R hydrogen, methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, n-amyl, methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, fluorine, chlorine, bromine, and when R is hydrogen, R may additionally represent nitro, amino, hydroxy, acetoxy, propionoxy, dimethylamino, diethylamino, di-n-propylamino, formylamino, acetylamino, propionylamino, butyrylamino or isobutyryl amino;

R hydrogen, methyl, ethyl, napropyl, iso-propyl, n-butyl,

iso-butyl or n-amyl;

R methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl,

n-amyl or benzyl;

-NR R pyrrolidino, piperidino, hexamethyleneimino,

morpholino, 2,6-dimethylmorpholino, piperazino, N- methylpiperazino, N-ethylpiperazino, N-benzylpiperazino or tetrahydropyridino.

groups shown Benzothiophene derivatives according to the invention have been shown to possess valuable pharmacological properties, more particularly antitussive properties and may contain one or more of the properties analgesic, antipyretic, antiinflammatory, local anaesthetic, antispasmodic and antihistaminic activity, in each case combined with relatively low toxicity. They may, therefore be used for the relief of tussive irritation and one or more of the symptoms, pain, inflammation, and pyresis of various origins.

In clinical practice the benzothiophene derivatives of the invention will normally be administered orally, rectally or by injection in the form of pharmaceutical preparations comprising the active ingredient in the form of the free base or one of the common pharmaceutically acceptable salts, e.g. the hydrochloride, in association with a pharmaceutically acceptable carrier which may be a solid, semi-solid or liquid diluent or an ingestible capsule and such preparations comprise a further aspect of the invention. Usually the active substance will comprise between 0.1 and 95% by weight of the preparation, for example, between 0.5 and 20% for preparations intended for injection and between 0.1 and 50% for preparations intended for oral administration.

To produce pharmaceutical preparations in the form of dosage units for oral application containing a compound of the invention in the form of the free base, or a pharmaceutically acceptable salt thereof, the active ingredient may be mixed with a solid, pulverulent carrier, for example lactose, saccharose, sorbitol, mannite, a starch such as potato starch, corn starch, amylopectin, laminaria powder or citrus pulp powder, a cellulose derivative or gelatine, and also may include lubricants such as magnesium or calcium stearate or a carbowax or other polyethylene glycol wax. and compressed to form tablets or centres for dragees. If dragees are required, the centres may be coated, for example with concentrated sugar solutions which may contain gum arabic, talc and/ or titanium dioxide, or alternatively with a lacquer dissolved in easily volatile organic solvents or mixtures of organic solvents. Dyestuffs can be added to these coatings, for example, to distinguish between different contents of active substance, For the preparation of soft gelatin capsules (pearl-shaped closed capsules) consisting of gelatin and, for example, glycerin, or similar closed capsules, the active substance may be admixed with Canbowax. Hard gelatin capsules may contain granulates of the active substance with solid, pulverulent carriers such as lactose, saccharose, sorbitol, mannite, starches (for example potato starch, corn starch or amylopectin), cellulose derivatives or gelatin, and may also include magnesium stearate or stearic acid. Dosage units for rectal application may be in the form of suppositories comprising the active substance in admixture with a neutral fatty base, or gelatin rectal capsules comprising the active substance in admixture with a Carbowax or other polyethylene glycol wax.

Liquid preparations for oral application may be in the form of syrups or suspensions, for example solutions containing from about 0.1% to 20% by weight of active substance, sugar and a mixture of ethanol, water, glycerine, propyleneglycol and, optionally, aroma, saccharin and/or carboxymethylcellulose as a dispersing agent.

For parenteral application by injection preparations may comprise an aqueous solution of a water soluble pharmaceutically acceptable salt of the active substance desirably in a concentration of 0.5l%, and optionally also a stabilising agent and/ or buffer substance in aqueous solution. Dosage units of the solution may advantageously be enclosed in ampoules.

Benzothiophene derivatives of the aforesaid Formula I may be produced according to a further aspect of the invention, by condensing a compound of the formula:

S/-COQ Q II with a compound of the formula:

Q3 Y-A'-N/ (wherein A Q and Q have the same meaning as A, R and R respectively, Q represents a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl or lower alkoxy group or provided Q represents a hydrogen atom, a nitro, lower acyloxy, lower dialkylamino or lower acylamino group or a hydroxy or amino group substituted by a protecting group replaceable by hydrogen by hydrolysis or hydrogenation, Q represents a lower alkyl group or a protecting group replaceable by hydrogen by hydrolysis or hydrogenation, Q represents a lower alkyl or benzyl group or NQ Q represents a pyrrolidino, piperidino, hexamethyleneimino, morpholino, tetrahydropyridino or lower dialkylmorpholino group or a piperazino, lower alkyl piperazino or benzyl piperazino group in which the nitrogen atom in the 4-position is substituted by a lower alkyl or benzyl group or by a protecting group replaceable by hydrogen by hydrolysis or hydrogenation, and X and Y represent atoms or groups reactable together to form an ether linkage between the benzothiophene moiety and the group Al) and, where a benzothiophene derivative which contains a hydroxyl group or a primary or secondary amino group is desired, replacing the protecting group or groups by hydrolysis or hydrogenation. Where the benzothiophene derivative is required in the form of a pharmaceutically acceptable salt the process may include the step of converting the product of the condensation step before or after removal of any protecting steps present into the desired salt. Where in the desired product R represents an acyloxy or acylamino group, there may first be formed the corresponding hydroxy or amino compound which is then acylated to give the desired product. Where in the desired product R represents an amino group, there may first be produced the corresponding nitro compound which is then hydrogenated.

In the compounds of Formulae II and III X may, for example represent hydrogen, sodium, potassium, rubidium or trialkylammonium, and Y may, for example represent halogen, such as chlorine or bromine or a functionally equivalent group such as benzenesulphonyl or toluylsulphonyl.

Starting materials of the general formula:

s OOR R IV Where R, R and R have the same significance as stated above, may be prepared by several different methods, as illustrated by the following reaction schemes:

Method A OOOH COOH SH SCH;COR

COOCH OH S-CH;COR S -COR R R2 Method B -0CH3 R0001 -OH COR S S 112 32 Method C R Rl COOH 000113 011 OH: SH COR S COR R. 2

Illustrative procedures for carrying out Methods A, B and C follow.

The thiosalicylic acids used as starting materials for the first stage of Method A were generally prepared by the standard method described for the preparation of thiosalicylic acid in the Organic Syntheses col. vol. II, 580.

w-[Z-carboxythioaryloxy]-acetophenones have been synthesised by the following procedure for carrying out the first stage of Method A:

A mixture of 15 g. of Z-mercapto-S-methylbenzoic acid, 26 g. of potassium carbonate, 22.6 g. of w-bromo-p-ethoxyacetophenone and 260 ml. of acetone was stirred and refluxed overnight. Water was added until a clear solution was obtained, any undissolved material being extracted with ether. The mixture was acidified and the product collected by filtration. After recrystallisation from alcohol 18.9 g. of w-[4'-methyl-2'-carboxythiophenoxy]-4-ethoxyacetophene (M.P. 153 C.) were obtained.

The following w-[2-carboxythioaryloxy]-acet0phenones have been prepared in an analogous way:

' oooH M.P., R I R1 R o.

4-0 CH H H 190 4-F H H 166 4-01 H 166 e s e 122 4-00 6-0113 H 174 fi-GHa H 190 i 11 i3? 4- H- 4-(3 -01 H 140 4-0oH3 H 154 w-[2-carbomethoxythioaryloxy] acetophenones have been synthesised by the following procedure for carrying out the second stage of Method A:

To an ice-cold solution of 5.6 g. of diazomethane in 250 m1. of ether, 29.4 g. of w-[4'-methyl-2'-car boxythiophenoxy]-4-ethoxyacetophenone are added in portions. After addition was completed, the mixture was allowed to warm to room temperature for 2 hours. The ether was then evaporated and the residue recrystallized from methanol. 31.2 g. of w- [4-methyl-2'-carboxymethoxythiophenoxy]-4-ethoxyacetophenone (M.P. 90 C.) were obtained.

The following w-[Z-carbomethoxythioaryloxy]-acetophenones have been prepared in an analogous way.

thesised by the following procedure for carrying out the third stage of Method A:

2.5 g. of sodium were dissolved in 200 m1. of absolute alcohol. 31 g. of w- [4'-methyl-2'-carbomethoxythiophenoxy]-4-ethoxyacetophenone were added in portions. The mixture was stirred and refluxed for 2 hours and then poured into ice water. After acidification with hydrochloric acid, the product was collected by filtration, washed with water and recrystallized from a mixture of methylethylketone and alcohol. 25.5 g. of a bright yellow compound (M.P. 140 C.) were obtained.

6.. The following 2-aroyl-3 hydroxy-benzothiophenes have been prepared in an analogous way.

3-methoxybenzothiophenes used as starting materials in Method B may be prepared from the corresponding 3-hydroxy benzothiophene by methylation with dimethylsulphate.

2-aroyl-3-l1ydroxy-benzothiophenes have been synthesised by the following procedure for carrying out Method B In a 500 ml. three-necked round bottomed flask fitted with a stirrer, a reflux condenser and a stopper, 30 g. of 3- methoxybenzothiophene and 35 g. of p-ethoxybenzylchloride were dissolved in 200 ml. of carbon disulphide. This solution was cooled in an icebath and 30 g. of anhydrous aluminum chloride were added in portions. After addition was complete, the mixture was refluxed for 3 hours on a water bath. The solvent was then distilled off and the residue treated with ice and ml. of 5 N hydrochloric acid. The mixture was extracted with ether, the ether layer washed with water, dried with sodium sulphate and evaporated. After recrystallization from methyl ethyl ketone 25.2 g. of 2-(p-ethoxybenzoyl)-3-l1ydroxybenzothiophene M.P. 139 C. were obtained.

The following 2-aroyl-3-hydroxy benzothiophenes have been prepared in an analogous way.

OH 1 hog I s 32 P. R R R C.

H H H 119 4-F H H 116 4-Cl H H 170 2-benzoyl-3-hydroxybenzothiophene has been synthesised by the following procedure for carrying out Method C A mixture of 12 g. of 2-benzoyl-3-hydroxybenzothio1 phene, 120 ml. of acetone, 19.5 g. of potassium carbonate and 7.5 g. of Z-dimethylaminoethylchloride hydrochloride was refluxed with stirring for 24 hours. The mixture was filtered and the acetone and volatile impurities removed by distillation under reduced pressure on a boiling water bath. The residue was dissolved in ether and the hydrochloride precipitated by the addition of a solution of hydrogen chloride in ether. The product was collected by filtration and recrystallized from ethyl acetate. In this way 4.7 g. of 2-benzoyl-3-NN dimethylaminoethoxy benzothiophene hydrochloride (M.P. 138 C.) was obtained.

EXAMPLE 2 A mixture of 8 g. of 2-(p-ethoxybenzoy1) -3-hydroxy-5- methylbenzothiophene, 200 ml. of acetone, 10.6 g. of potassium carbonate and 4.8 g. of pyrrolidinoethylchloride hydrochloride was refluxed for 24 hours. The product was isolated in the same way as described in Example I. After recrystallization from acetone, 7.0 g. of 2-(p-ethoxybenzoyl) 3 pyrrolidinoethoxy-S-methylbenzothiophene hydrochloride (M.P. 169 C.) was obtained.

EXAMPLE 3 A mixture of 11 g. of 2-(p-tert-butylbenzoyl)-3-hydroxybenzothiophene, 110 ml. of dioxane, 14.5 g. of potassium carbonate and 6.63 g. of pyrrolidinoethylchloride hydrochloride was refluxed for 24 hours. The product was isolated in the same way as described in Example 1. After recrystallization from acetone 7.7 g. of 2-(p-tert-butylbenzoyl)-3-pyrrolidinoethoxy benzothiophene hydrochloride (M.P. 162 C.) was obtained.

EXAMPLE 4 In a 500 ml. flask with a stirrer and reflux condenser 8.4 g. of p-toluenesulphonyl chloride, 200 ml. of acetone and 5.1 g. of pyrrolidinoethanol were mixed. The mixture was refluxed for 10 minutes and cooled. 12.5 g. of Z-p-ethoxybenzoyl)-3-hydroxy-5-methylbenzothiophene and 16.6 g. of potassium carbonate were added and the mixture refluxed overnight. The mixture was then cooled and filtered and the acetone solution was evaporated. The residue was extracted with boiling ether, the ether solution was evaporated and the residue dissolved in 200 ml. of acetone. This solution was acidified with hydrogen chloride in acetone and filtered hot. The solution was concentrated to a small volume, which on cooling deposited 2 (p-ethoxybenzoyl)-3-pyrrolidinoethoxy 5- methylbenzothiophene hydrochloride (M.P. 169 C.).

EXAMPLE 5 A mixture of 9 g. of 2-p-ethoxybenzoyl)-3-hydroxy-5- methylbenzothiophene, 200 ml. of acetone and 10.8 g. of 2-pyrrolidinoethy1 chloride were refluxed over night. 10 g. of potassium carbonate was then added and the mixture stirred under reflux for some minutes. The product was then isolated in exactly the same way as described in Exethoxy-S-methylbenzothiophene hydrochloride, after several recrystallizations from acetone, had a melting point of 169 C.

EXAMPLE 6 A mixture of 12 g. of 2-benzoyl-3-hydroxybenzothiophene, m1. of triethylarnine and 7.5 g. of dimethylaminoethylchloride hydrochloride was refluxed over night. 20 g. of potassium carbonate was then added. The mixture was filtered and the residue treated as described in Example 1. After several recrystallizations from ethyl acetate, 2 benzoyl 3-NN-dimethylarninoethoxybenzothiophene (M.P. 138 C.) was obtained.

EXAMPLE 7 EXAMPLE 8 Example 2 was repeated with the potassium carbonate replaced by an equivalent amount of rubidium carbonate. In this way 7.2 g. of 2-(p-ethoxybenzoyl)-34pyrrolidinoethoxy 5 methyl benzothiophene hydrochloride (M.P. 169 C.) was obtained.

EXAMPLE 9 A mixture of 12 g. of 2-benzoyl-3-hydroxybenzothiophene, 120 ml. of acetone, 19.5 g. of potassium carbonate and 11.5 g. of B-diethylaminoethylbromide hydrobrornide was refluxed over night. After working up in the manner described in Example 1, 8.6 g. of 2-benzoyl-3-NN diethylaminoethoxybenzothiophene hydrochloride (M.P. 107 C.) were obtained.

EXAMPLE 10 Example 2 was repeated with the acetone replaced by an equal volume of dimethylformamide. 6g. of 2-(pethoxybenzoyl)-3-pyrrolidinoethoxy 5 methyl benzothiophene hydrochloride (M.P. 169 C.) were obtained.

The following compounds have been prepared in an ample 2. The product, 2-(p-ethoxybenzoyl)-3-pyrrolidino- 50 analogous way:

R3 A R R R N/ Equivalent weight Calcu- M.P., R Found lated O.

Example: CH3

11 CH -CH H H -N 354 361 CHa CzHs

12 Same as above Same as above H H N 388 390 112 CH -CH; 13 .-d0 C(CH;)3 H H -N 442 444 162 CHz-CHz CgHs 14 do -F H II N 406 408 159 czHg CHZ'CHZ 15 do Same as above II II N 407 406 177 r 9 TABLE-Continued n V R3 A I R I R1 R2 N/ Equivalent weight w v R Found 1 3 1 56 Example CzHs 16 ..d0 ,Cl H H --N 420 424 187 CHrCHa 17 ..d0 Same as above H H -N 426 422 196 v v v CHT H2 CH-CH 18 CHz-CH d0 H H -N CH 435 434 215 I CHTCHI CH2-CH2-CHI 19 CHz-CHz- -d0 H H -N 447 450 144 l cHa-om- H2 C2116 20 Same as above Q-ocm H H -N 418 420 1 CzHs GHQ-CH2 21 -Q -do Sameasabove H H N 414 418 177 \CHZ'CHZ CHz-CH 22 d0 .410 H H N CH 430 430 190 (JHz-cHz CHz-CHz-CHz 23 -d0 "do H H N 441 446 128 CHz-CH2-CH3 V 02115 24 --do Q-O CzHi H H -N 430 434 I V .1 Cz s CHz-CH: 25 -do Same as above H H N 432 432 140 CH2-CH2 OHTCHI 26 ..d0 d0 H H -N CH2 440 446 180 CHa-CHa CHg-CHQ 27 d0 -.d0 H H --N O 448 448 CHz-CH;

28 "d0 -.d0 5-CH H -N 452 448 187 CzH5 CHz-CH: 29 .dn Same H -N 448 446 169 aHz-eHg CHz-CH: 30 d0 do ..do H N CHz 465 460 157 CH -CH2 OHzCHg 31 ..do H 6-CH N 401 402 166 CHzCHz GH -CH2 s2 -do --0 c2115 s-om Same.-.- -N 471 460 104 TABLE.Continued Equivalent weight A P. R 32 Calcu- M.P., R Found lated C.

Examplez. v v 33 .do Same as above -01 H Same as above 459 466 149 fun-0H1 34 -do d0 7-Cl H N' CH; 482 480 180 CH2-CH2 /CHn-CH 35 CHzCHz ...d0 S-OCH; H -N\ 469 462 93 CHg-CH; 36 -CHz-CHz -do Same H N /O 485 478 121 OHz-OH: CHE-0E2 37 --CHg-CHz CH H II N O 343 342 170 GHQ-CH1 CHZ-CHI 38 Same as above C(CH3)3 H H N\ 364 363 166 CH2OH2 39 .d0 @0113 5-Br 11 Same as above 433 431 174 40 ..do --o 02115 Same 11 ..do 511 511 169 41 -CHzCHz-CH: Same as above ..do H N 529 527 136 OH;- H: 42 -OHzCHz- -....do d0. H -N\ O 560 555 170 CH2?H2 CH EXAMPLE 43 substance which are suitable for use as analgesic tablets.

An antitussive syrup containing 0.5% (weight per volume) of active substance was produced from the following ingredients:

2 (p ethoxybenzoyl) 3 (B-morpholinoethoxy)- benzothiophene 0.5 Saccharin 0.6 Sugar 3.0 Glycerin 5.0 Distilled water 10.0

Aroma 0.1

Ethanol 96% to 100.0 ml.

The sugar and saccharin were dissolved in hot distilled water. On cooling, the solution was made up to weight with Water and the glycerin was added. The aqueous solution was poured into a solution of the active substance and aroma in about ml. of ethanol and then made up to 100 ml. with ethanol.

The active substance may be replaced with one of its pharmaceutically acceptable acid addition salts.

EXAMPLE 44 The tablets can be marked with break lines to enable a dose other than 25 mg. or a multiple thereof to be administered.

Antitussive tablets may be prepared by replacing the above active substance by 2-(p-ethoxybenzoyl)-3-(;3- pyrrolidinoethoxy) -5-methoxybenzothiophene.

EXAMPLE 45 A granulate was prepared from 250 g. of Z-(p-ethoxybenzoyl) 3 (fl-pyrrolidinoeth'oxy)-5,6-dimethylbenzothiophene, 175.90 g. of lactose and an alcoholic solution of 10 g. of stearic acid. After drying, the granulate was mixed with 56.60 g. of colloidal silica, 165 g. of talc, 20 g. of potato starch and 2.50 g. of magnesium stearate and pressed into dragee centers (10,000). These were first coated with 6 g. of shellac, then with a concentrated syrup containing 502.28 g. of crystallized saccharose, 10 g. of gum arabic, 0.22 g. of dyestufi and 1.5 g. of titanium dioxide, and dried. Analgesic dragees weighing 120 mg. and containing 25 mg. of active substance were obtained.

When 2 (p ethoxybenzoyl)-3-(p-morpholinoethoxy)- benzothiophene was used as active substance, antitussive dragees were obtained.

EXAMPLE 46 1.0 g. of 2-(p-ethoxybenzoyl)-3-(/3-pyrrolidinoethoxy)- S-methylbenzothiophene and 0.10 g. of ascorbic acid, were dissolved in distilled water to make ml. This solution, each ml. of which corresponds to a content of 10 mg. of active substance, was used to fill ampoules which were sterilized by heating in the usual way.

V Analgetic effect 7 The analgetic effect was estimated by stimulation of the tail in mice by light and heat by the method of Gross, Helv. Physiolog. Acta C 31 (1947) with the apparatus of Friebel and Reichle, Arch. Exp. Path. u. Pharmakol. 226, 551 (1955). The reaction time before and after the administration of the test substance was measured. The dose which gives a 50% increase in reaction time 60 minutes after the administration (ED is given. The analgetic eifect of the compounds is reported in the following way ED p.o. mg./kg. bodyweight: Analgetic eifect As a comparisonthe analgetic effect of codeine phosphate and d-propoxyphene hydrochloride was estimated using the same method. All compounds were given orally.

Antitussive eflfect 14 ED Antitussive eifect mg./ kg. bodyweight (a);

As a comparison the effect of codein phosphate was estimated using the same method.

Spasmolytic efiect The spasmolytic effect was estimated in classical way by measuring the reversion of BaCl =induced spasm in the isolated small intestine of the guinea pig. A comparison with the spasmolytic effect of papaverine and diphenhydramine=HCl was carried out and the effect of the test substance is recorded in parts of the elfect of papaverine resp. diphenhydramine=HCL Toxicity The substance to be tested was administered intraperitoneally or orally to 3-4 groups of 10 albino mice. The animals were observed for 24 hours. The number of mice which were killed by the substance at each dose was recorded and expressed in percent of the number of animals injected at this dose. The dose of the test substance which killed 50% of the animals (LD was estimated from a logarithmic dose response curve based on 3 to 4 doses. The results are given in Table II.

The result of the pharmacological test are indicated in Tables I and II. A, R, R R and NR R have the specified significance.

TABLE I.ANALGETIC AND ANTITUSSIVE EFFECT Anti- Analgetic tussive efieet, efieet, A R R R -NR R p.o. i.v.

Code Number:

43/59.; CH2CH2 0(OH H H I l /CH 57/16 Same as above" H H N CH; /C2Hs 57/14 do Same as above H H -N\ 57/58 do -0(OH3)3 H H N 57/21 10 F H H -N\ 43/49 CHCH2- Same as above H H I l /C2Hfi 43/25 0H CH2 -c1 H H N\ 43/26 Same as above" Same as above H H -I I\ 43/28 do do H H N /CzH5 v 41/99 .-do OGH: H H N\ 43/22 do Same as above H H N TABLE I.-Continued Anti- Analgetic tussive effect, efiect, A R R R --NR R p.0. i.v.

43/24 do do H H -N D /CgH5 41/90 -0 CZHB H H N\ CgH 53/83 .do Same as above H H -N 41/89 ..d0 .do H H N 53/84 do ..d0 H H N O L/ /CgH5 63/24 .-do d0 5-GH3 H N\ CzHB 63/23 do d0 Same as H -N above 63/25 .do .d0 ..do H N 57/40 do H 6-0113 N 67/23 ..do O C2115 5-0113 Sane as Same as above.

a ove.

63/35 ..do Same as above 5-0011; H do 63/36 do do Same as H -N O above.

d-lrgpoxyphene. Codeiii phosphate TABLE II.-SPASMOLYTIO EFFECT AND TOXICITY Toxicity LDsn bodyweight A R R R -NR R Spasmolytic efl'eet p.o. Lp.

Code Number:

53/84 -CHzCHz- O CzHi H H N 0.7 x papaverme 1,600 680 67/23 CH1OHz Same as above 5-013 G-OH; Same 500 130 d-Propoxyphene. H01 240 100 Codein phosphate 0.03 x diphcn- 750 140 hydramine, Papaverine 0.7 diphenhydramino We claim: 55 one to five carbon atoms, alkoxy having from one to '1. A pharmaceutical composition comprising as an active ingredient an effective amount of a benzothiophene derivative represented by the formula four carbon atoms, fluorine, chlorine and bromine; NR R is a radical selected from the group consisting of dialkylamino with from one to five carbon atoms in each alkyl group, pyrrolidino, piperidino, hexamethyleneimino, morpholino, lower dialkylmorpholino, and tetrahydropyridino; and A represents an alkylene radical containing not more than four carbon atoms; and a pharmaceutically acceptable salt thereof, in association with a pharmaceutically acceptable carrier.

2. A pharmaceutical composition according to claim 1 in which the radical R in said active ingredient is alkyl with from 1 to 5 carbon atoms and a pharmaceutically acceptable salt thereof.

3. A pharmaceutical composition according to claim 2 in which the radical R in said active ingredient is tertiary butyl.

4. A pharmaceutical composition according to claim 2 in which the radical R in said active ingredient is methyl.

5. A pharmaceutical composition according to claim 1 wherein the radical R in said active ingredient is selected from the group consisting of phenyl, phenyl substituted by alkyl having from one to our carbon atoms, phenyl substituted by alkoxy with from one to four carbon atoms, fluorine substituted phenyl, chlorine substituted phenyl, and bromine substituted phenyl.

6. A pharmaceutical composition as described in claim 1 wherein the radicals R, R and R in said active ingredient are as defined in claim 1 and the radical NR R is a radical selected from the group consisting of dialkylamino with from one to five carbon atoms in each alkyl group, pyrrolidino, piperidino, morpholino and tetrahydropyridino, and a pharmaceutically acceptable salt thereof.

7. A pharmaceutical composition according to claim 1 wherein the radical R in said active ingredient is selected from the class consisting of hydrogen, chlorine, methyl and methoxy, R is selected from the group consisting of hydrogen, chlorine, methyl and methoxy, and NR R is a radical selected from the group consisting of pyrrolidino, morpholino and diethylamino, and a pharmaceutically acceptable salt thereof.

8. A pharmaceutical composition according to claim 1 wherein the said active ingredient is the benzothiophene derivative of the formula:

GHQ-CH2 s oo--0 can,

and a pharmaceutically acceptable salt thereof.

9. A pharmaceutical composition according to claim 1 wherein the said active ingredient is the benzothiophene derivative of the formula:

CHz-CH:

O-CHz-CHz-N CH3- Hg and a pharmaceutically acceptable salt thereof.

10. A pharmaceutical composition according to claim 1 wherein the said active ingredient is the benzothiophene derivative of the formula:

and a pharmaceutically acceptable salt thereof.

11. A pharmaceutical composition according to claim 1 wherein the said active ingredient is the benzothiophene derivative of the formula:

CH CH 0CHgCHr-N CH3-CH \SAOO-Q-O 02115 and a pharmaceutically acceptable salt thereof.

13. A pharmaceutical composition according to claim 2 in which in said active ingredient the radical R is tertiary bntyl, the radical A is CH CH radicals R and R are hydrogen and the radical NR R is pyrrolidino. 14. A pharmaceutical composition according to claim 2 in which in said active ingredient the radical R is methyl and the radical A is -CH -CH radicals R and R are hydrogen and the radical NR R is morpholino.

15. A method for alleviating tussive conditions which comprises administering to a patient suffering from such condition a pharmaceutical acceptable amount of a composition described in claim 1.

16. A method for alleviating pain which comprises administering to a patient suffering therefrom an analgesic amount of a composition as described in claim 1.

References Cited UNITED STATES PATENTS W105) UNITED SKATES PATENT OFFECE @ERFNEQATE Oi? fiQRREQTION Patent No. 3,594 $78 Dat d July 20, 1971 Inventor) Arne Elof Bxands'trum, et a].

It is certified that error appears in the ab0ve-identified patent and that said Letters Patent hereby untreated as shown below:

Col. 5, line 5 -et11amgmcetophene shculd be 1 f e tnoixyacetephenene Col 6 Table at lines; 3 through 19 inclusive, the last 5 lines: eiwinqrld replaced by the following 4 lines:

C01: 7 ili'HHW; "Ail am? F of W rethmcybenzoyl) should he of 2' (p -ethoxybenrmylU -g Cole 7, line 44 0f i-p--ethoxybenzoyh should be be of 2 (p 9thmxybenzoyl) Cal. "F, Example ll, 315i; UQ should be -CH -CH Cola ll line 68 of p--ethcmybenzmyl,3 should be Mr sf 2 (p-ei:hcxybenmay].1

C01. 1.11. line 6?", -3-8--pyrrmlifiinoethoxy)" should be --3-(a-pyrrc lidineethoxy) Col. 1.4, line 1'3 *"Beffl induced shuuld be BaCl -induced Col. 1.4, line. 15, "diphenhydramine HCl" should be diphenhydramihe: -HC'1.

Col. 14, Code No 43 159 under Anti-'l:ussive effect, i.f.,

"++" sshould be Colm 1?, line 0111? should be four L fignmd and smiled this "I 1 th day of April 1972.

.Attest:

EDEJARD MJ LATICHLJR,J30 ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 

